I'd probably go through a brief withdrawal period of sheer and utter boredom, as I've been spending a lot more time online than normal (and against my better judgment, at that). Afterwards, though, I'd likely become absurdly productive for the first time in a long time.
For starters, I'd finish the five or six books I've been meaning to finish (that'd take a couple weeks, a month at most). Start practicing my instruments again, as well as start drawing again, exercise more, and just find a whole bunch of ways to spend the many, many hours of free-time that I'm no longer spending online. I'd still play games, of course, but I'd spend my time playing them much more wisely.